body{
    background-color: #f2f2f2;
}
.head{
    background-color: white;
    height: 80px;
    box-shadow:0 2px 2px #a7a7a7;
}
.d1{
	height: 80px;
	overflow: hidden;
	margin-left: 20%;
	display:flex;
    align-items:center;
}
.s1 {
    margin-left: 20%;
}

.d1 img{
	max-width:15%;
	max-height: 80%
}

.s2{
    margin-left: 15%;
}

.navigation{
    margin-top: 15px;
    margin-left: 20%;
    margin-right: 20%;
    min-width:780px;
    height: 60px;
}

.navigation div{
    width: 33.33%;
    float: left;
    height: 40px;
    line-height: 40px;
    text-align: center;
    color:#333333;
    /* background-color: white; */
    
}

.explain{
    margin: 0% 20%;
    min-width:780px;
}

ul{
    list-style-type: none;
}

ul li{
    color: #a7a7a7;
    font-size: 14px;
}

input{
    border-radius: 4px;
}

input[type=button]{
    background-color: #00afe9;
    border: none;
    color:white;
    height: 35px;
    min-width: 120px;
    margin-right: 10px;
}